CO2 fluxes in a wet tropical forest area in Western Amazon in year of El Niño

Authors

  • Bárbara Antonucci Universidade de São Paulo, São Carlos
  • Renata Gonçalves Aguiar Universidade Federal de Rondônia, Ji-Paraná
  • Leonardo José Gonçalves Aguiar Universidade Federal de Pelotas, Pelotas
  • Nara Luísa Reis de Andrade Universidade Federal de Rondônia, Ji-Paraná

DOI:

https://doi.org/10.5902/2179460X30718

Keywords:

Carbon, Microclimate, Variability

Abstract

The objective this paper was to quantify the hourly variability of CO2 fluxes in the year of the El Niño, in 2015, in a tropical rain forest in the Western Amazon. Data of CO2 fluxes collected at 63.5 m height in a tower of the Large-Scale Biosphere–Atmosphere Experiment in Amazonia in the Jaru Biological Reserve, composed of the Open Ombrophilous forest, were analyzed. Data from the dry-wet period were used, which by convention, the negative and positive values indicate absorption and emission of CO2, respectively. The CO2 uptake in the forest had higher levels between 9:30 a.m. and 4:00 p.m., with mean values between -19 and -13 μmol m-2 s-1, however the peak absorption occurs at 1:00 p.m. with -30 μmol m-2 s-1, considering that at this time the sun's rays are most intense. In average, the Rebio Jaru absorbs more than the areas of the transition Amazonia-Cerrado, indicating that the physiological activities in Ombrophilous forest require a greater amount of carbon. The average daily behavior of CO2 fluxes showed higher concentrations of absorption during the day than emissions overnight, behaving as a carbon sink, corroborating the importance of the forest in assimilation of the atmospheric carbon.

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References

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Published

2018-03-22

How to Cite

Antonucci, B., Aguiar, R. G., Aguiar, L. J. G., & Andrade, N. L. R. de. (2018). CO2 fluxes in a wet tropical forest area in Western Amazon in year of El Niño. Ciência E Natura, 40, 119–125. https://doi.org/10.5902/2179460X30718

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